Throttle control mechanism



June 9, 1936- E. .1.r sAMPsoN THROTTLE CONTROL MECHANISM Filed June 17, 1955 f BY g-zggmgvf ATTORNEY WITNESS Patented June 9, 1936 PATENT OFFICE THROTTLE CONTROL MECHANISM Edward J. Sampson, Corpus Christi, Tex.

Application June 17, 1935, Serial No. 27,120

5 Claims. (Cl. 192--.01)

My invention relates to improvements in throttle controls for internal combustion engines.

By way of explanation, the internal combustion engines of tractors are usually equipped with a throttle control including a hollow rock shaft settable in opposite directions to increase or diminish the flow of fuel to the engine, a spark control `shaft extending through the fuel control shaft,

and hand levers cooperatingV with a detent segment for setting said shafts. In starting the engine with this form of control, it is difficult to gauge the exact amount of fuel required to start the engine and overcome the inertia of the tractor Awhen the clutch is engaged without stalling the engine on the one hand, or, on the other hand, racing the same with consequent damage to the Vclutch facings, oil dilution, and wear and tear on the mechanism in general.

With the foregoing in mind, the primary object of my invention is to equip a gasoline engine, having the type of control above specified, with an auxiliary control operative under control of the clutch shifting mechanism of the tractor to rock the fuel control shaft in the proper degree to admit to the engine the exact quantity of fuel required to start the engine and overcome the inertia ofthe tractor. f

Another object is to provide means for presetting the auxiliary control to vary, under different operating conditions, the feed of fuel.

Another object is to provide an auxiliary control for the purposes specified which permits independent setting of the fuel control shaftby its hand lever.

A further object is to provide for a variable Vsetting ofthe fuel control shaft to obtain proper Y idling speeds of the engine under different operating requirements.

Other and subordinate objects will presently appear and the nature of my improvements will be readily understood from a reading of the following description and claims incon'junction with the accompanying drawing.

In said drawing:

Figure 1 is a perspective View of a part of the engine and fuel supply tank of the tractor and illustrating my improved auxiliary control applied to the engine.

Figure 2 is a fragmentary view in vertical transverse section taken 0n the line 2-2 of Figure 1 and drawn to an enlarged scale. l

Figure 3 is a similar view of a modification of the invention.

Figure 4 is a view in transverse section taken on the line 4-4 of Figure 3 and Figure 5 is a view in side elevation of a further modification of the invention.

With reference to the drawing, the numeral I designates a portion of the engine of a tractor, 2 the fuel tank therefor, and 3 the steering mechanism all shown in dot and dash lines. 'I 'he numeral 4 designates a hollow-fuel control Vrock shaft connected at o-ne end, in a manner well understood and not requiring explanation herein, to the usual carburetor, and having its opposite end mounted in a bracket 5y bolted to theA engine casing as at 5 and having a detent segment B thereon. Adjacent the segment 6 the shaft 4 has mounted thereon a hand lever 1 for cooperation with said segment and by means of which the shaft is set in opposite directions to throttle opening and closing positions respectively. Within the shaft 4 is the usual spark con-. trol shaft `8 adapted to be rocked by the hand lever 9 to control the spark in a manner not important to the present disclosure. The numeral I0 designates the clutch control lever vertically movable, in this instance, in opposite directions to clutch engaging and disengaging positions, re-

' spectively, and tensioned by a suitably connected spring I I for movement to engaging positions.

According to my invention, in its preferred embodiment, the clutch control lever I0 is op-eratively connected to the fuel control rock shaft 4 as follows. An annular collar I2 is removably secured upon the shaft 4 by means of a screw I3 passing through said collar. A pair of blocks I4 are clamped upon opposite sides of said collar by vmeans of bolts I5, wing nuts I6 upon the outer ends of said bolts, a plate I'I disposed upon the upper edge of one of said blocks and through which the bolts I5 pass, and tension springs I8 interposed between the wing nuts Iii and the plate Il. The blocks I4, the plate I'I, bolts I5 and nuts I6 comprise a rocking unit for frictionally 4' engaging the collar I2 to rock the shaft 4. 'Ihe plate VI 'I extends beyond the ends of the blocks I4 one of its extended ends being provided with a series of apertures I 9. A rod 2U, having aV hooked end 2| secured in one of said apertures I9 by a 4 lil Y Vment of the lever I tov clutch engaging position.

A stop V28 in the form of Ya-set screwmounted in a bracket 29, fixed to the engine casing as at Y3l),V

foverhangs,theoppositeend ofV the` plate I1 and the lever I0 to clutchdisengaging position. A setV 151 throttie @105mg position untiithe plate Yl1 en- Y Y limits movement of theshaft 4 by movement of screwV 3| mounted upon the Ysegment 6Y limits Vmovement'of the shaft 4 to throttle closing position by `engagement with the handlever 1.

' VReferring to the operation'of` the above-degages the set'screw V28. Thehand lever 1lis then moved against the set screw 3| to YVrock the fuel ,controlshaft 4 Aindependently in'proper degree Y to secure the desired idling speed ofthe engine jasdetermined by adjustment ofthe setscrew 3 I.Y Obviously upon release of theclutchcontrol leverV I0 the fuel control Vshaft 4 will be rocked-in a reverse, i. e. throttle opening' direction, in fixed in accordance withY Vthe exact requirements forV degree which degree may be vvaried by means of the set Vscrew 2.8 to regulate the feed of the fuel Vstartingthe engine andovercoming the inertia Y ofv the load imposed thereon when the clutch is Y engaged.V `The Vfeed maybe increased or dimin- Y Y shaft 4 through'the medium of the hand lever 1, Y

ished by independently rocking the fuel control the' spring 25 as will be clear, permitting Va full @downward stroke `of the lever .I0 and movement in less degree of the blocks 12,1 rod 20, and parts carried thereby; .The degree of movementlof the blocks I2 may befvaried by 'positioning the end 'e 2`I' of therod 20 in different apertures-|9VV in the plate I1.

. -In themodification shown in Figure aflever Y 32 is used in'lieu yofthe' previously"described,V

Vblocks I2, fsaid lever being loosely mounted on the fuel cntrolshaft 4 and frictionally. clutched f to the same Vas follows.Y A pair of friction discs 33 lare loosely mounted on said shaft upon oppo- Y site sides of said lever saidV discs being `formed of A any suitable, preferably fibrous, material. A discl 34, complementalito'one of'saidV discs 33jissecured Vupon the shaft 4 inYf'rctional'engagementV fwithis'aid'disc r33'by means of aA set screw 34 threadedinto a hub 35 onV said disc 34. A sleeve 35 having an end flange 31` complemental .totheV fother disc 33-is loosely mounted on the shaft- 4 VV' Ywith one Vend thereof projecting into a-sleeve 38 f ;`Y 5f la'djustably mounted on said shaft 4 by means of 'a set screw'39. A tension spring 40 is interposed Y Y tionally clutched tosaidshaft to rock the Ysaine'.

between-said sleeve 38 and flange-31; The sleeves Y VV36V and38 are splined to each other by means of Y. a .slot, 4I rin the sleeve 3B anda bolt 42-in the Y Y' sleeve `38p'rojecting intosaidj slot. YThe .tension springV 40,'as Will be clear, causes Ythe 'discs 33, .34,

' iV and flange 31 to frictionally clutch the' lever 32 Y Yto the shaft :'4' and Vthis,clutching-{relation-may 5 V1 be varied byV adjustment of the Vsleeve V38 longitudinallyofthe shaftl4.1f,

d L In Figure Ythere is shown a modiiiedformof the invention .for yieldingly connecting Ythe rod V20 to'rarclutchcontrol rod endwise movable.V YThis connection Vtakes the form of a bell crank` 43 throughoneend of which the rod 2U passesV andV is yieldin'gly connected thereto inthe same mani ner as Vdescribed Y,with reference to the preferred formof Ythe invention. The opposite end of the bell crank, 43 is conne'ctedtotheendwise mov- Y :"'fable` shaft 44 by means of collars 45,Y a cotter pin'46bearing against one of the collars 45 and clutch disengaging position. j

a tension spring 41 interposed between the otherY collar 45 and a collar 4Bi'ixed against movement under the action of said spring by a cotter pinY 49.

The arrangement of Vthe described* connecting Y Y parts is such that. the clutch control shaft 44 is, 5 Y

yieldinglyl movable inV opposite directions; relativeto the rod 20.. Y Y

f VThe Yforegoing Vis a Vdetailed description of a preferred form of my invention and certain modi-` iications thereof, but it is to be understood'that-l() 'A Y other modifications ,may be resorte-dto without .A

' departing from the inventive conceptrdisclosed nor the scope of the appended claims'.VV Y Y WhatI claim is:

shaft of an internal combustion engine, said shaft frictionally clutched to said shaft to'rock the same, and permit independent vrocking of ,said 'Y shaft, and means for imparting al limitedVv and d Variable degree .of rocking movement to saidunit 2.5VV by operation of'said member to clutch engaging. z position.V Y i Y Y 2.V The'combination with a throttle control rockV4 Y shaft of an Vinternal combustion engine,said shaft being; manuauy semaine, in oppositedirections w30; throttle opening and closingv positions, respecj tively, and a clutch control member movable'in x Y oppositeV directions to clutch engaging andfdisengaging positions, respectively, of a rocking unit frictionally clutched to said'shaftto rock the 35 same and'permit independent rocking ofV said shaft,V and meansrfor imparting. a limited and variable degree of rocking movement to said unit by operationof-said member to; dummer;gaiging,A if f Y Y position, andv includingfoperating connections Vbey tween said Y unit and member yielding during -movement of the .latter to clutch diseng'agingf position, and a settable'stopforlimiting move-V V ment of saidrunit by operation of said member to,

Y j fdy5 3. The combination with a throttle control rock Y Y -shaftdof an internal combustion engine, said shaft being manually settable in Opposite directions to;

Vthrottle opening andY closingV .positionarespec-a i tively, land a clutch control'lever movable in'50 .n

opposite directions 'tcY clutch engagingand ,dis- .Vlr

' engaging positions, respectively,' and .tensionedV for movement to engaging position, of ajsettable stop for limiting Imovement of saidshait inthrottle'closing direction, a Yrocking unitrfricr`f55 and permittingindependent setting of saidshaft,

j and vmeans for limparting a limited Vdegree vof Y Y movement to said lunit by operation of said levervk to `clutch engaging position` and including oper- `ating connections between said lever Yand unit rock shaft ofr an internal'combustion engine, said shaft being,manuallygsettable inlopposite direotions to throttle opening `and'rclosing positions,

respectively, a settinglever for said shaft, and a clutch control lever movablein opposite Vdirectionsto clutch engaging Ydisengaging positions, respectively, and tensioned forY movementY to engaging position, of means Yfor imparting a limited Variable degree of rocking movement to 75 1. The combination with a tnrottie contra rock V15 said shaft in a throttle opening direction by movement of said lever to clutch engaging position and permitting independent setting of said shaft said means comprising a collar fast on said shaft, a pair of opposed blocks yieldingly clamped to said collar to frictionally engage the latter, operating connections between said blocks and lever including a rod, a connection between said rod and lever yielding during movement of the latter to clutch disengaging position, a variable connection between said rod and blocks for altering the throw of said blocks relative to that of said lever, and a settable stop for limiting movement of said blocks by movement of said lever to clutch disengaging position.

5. The combination with a throttle controlling rock shaft of an internal combustion engine, said shaft being manually settable in opposite directions to throttle opening and closing positions, respectively, a setting lever for said shaft, and a clutch control lever movable in opposite directions to clutch engaging and disengaging posishaft, a pair of opposed blocks yieldingly clamped to said collar to frictionally engage the latter, operating connections between said blocks and lever including a rod, a connection between said rod and lever yielding during movement of the latter to clutch disengaging position, a variable connection between said rod and blocks for altering the throw of said blocks relative to that of said lever, a settable stop for limiting movement of said blocks by movement of said lever to clutch disengaging position, and a settable stop for limiting movement of said shaft by said setting lever in a throttle closing direction.

EDWARD J. SAMPSON. 

